EP2732766B1 - Appareil de radiographie - Google Patents

Appareil de radiographie Download PDF

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Publication number
EP2732766B1
EP2732766B1 EP13181626.6A EP13181626A EP2732766B1 EP 2732766 B1 EP2732766 B1 EP 2732766B1 EP 13181626 A EP13181626 A EP 13181626A EP 2732766 B1 EP2732766 B1 EP 2732766B1
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EP
European Patent Office
Prior art keywords
ray
ray source
detecting device
center
image detecting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP13181626.6A
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German (de)
English (en)
Other versions
EP2732766A1 (fr
Inventor
Ho-Hui Hsieh
Meei-Ling Jan
Tien-Hsiu Tsai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Institute of Nuclear Energy Research
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Institute of Nuclear Energy Research
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Publication of EP2732766A1 publication Critical patent/EP2732766A1/fr
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/50—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment specially adapted for specific body parts; specially adapted for specific clinical applications
    • A61B6/51—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment specially adapted for specific body parts; specially adapted for specific clinical applications for dentistry
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/06—Diaphragms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K7/00—Disposition of motor in, or adjacent to, traction wheel
    • B60K7/0007—Disposition of motor in, or adjacent to, traction wheel the motor being electric

Definitions

  • the present invention relates to an apparatus for X-ray photography, and in particular, to an apparatus for X-ray photography that can keep an X-ray beam away from a non-imageable area in a photographing process.
  • Extraoral dental X-ray radiography such as two-dimensional dental panoprex and three-dimensional computed tomography (CT) is often used for radiographing teeth, the jaw and facial bones, and peripheral soft tissues, and is a useful tool in dental diagnosis and auxiliary treatment.
  • CT computed tomography
  • An X-ray photographical contrast mainly results from penetration attenuation caused by components, density and thickness of a matter penetrated by an X-ray, and most photon energy lost in the penetration process is absorbed by human tissues and is converted into a radiation dose.
  • targets of dental X-ray radiography are mainly located below the cranium base of the skull 10 and in a range of the oral cavity and the jaw and facial bones in front of the external acoustic meatus (EAM).
  • the petrous pyramid and the midsagittl plane are boundaries of the shape of the cranium base, and a symmetrical pyramid structure with the sellaturcica 11 as a vertex and having left and right angles of 47 degrees is a non-imageable area.
  • an actual range required in dental X-ray radiography includes an area in the cranium base with the petrous pyramid and the midsagittl plane as boundaries and the sellaturcica 11 as a vertex and having left and right angles of 133 degrees and a round cake column range having a height from the infraorbitomeatalline (IOML) of the skull to the mandible base.
  • IOML infraorbitomeatalline
  • a non-imageable head and neck area that is, the non-imageable area formed by a symmetrical pyramid structure area with the sellaturcica 11 as the vertex and having left and right angles of 47 degrees
  • a radiation dose received by the human body is increased. If the synchronized center rotation scanning avoids scanning the non-dental imageable area such as the head and neck portion, sufficient X-ray projection image information cannot be obtained, so that a complete dental X-ray image cannot be formed.
  • a dental X-ray photography device uses a collimation device in order to collimate the X-ray beam and to reduce the amount of diverging beam components and to reduce the beam size to a size sufficient for the examination.
  • the reduced beam size ensures that the examination can be performed precisely on the area of interest without unnecessary irradiation of human tissue that does not belong to the area of interest.
  • the smaller beam divergence leads to an even greater precision of each measurement due to the absence of spurious divergent beam components.
  • these advantages, small beam size and small beam divergence come at the expense of beam intensity as the unwanted beam components are filtered out of the incident beam, thus, substantially reducing the intensity of the beam that reaches the target. In order to compensate for the weaker beam intensity measurements need to be performed longer to achieve comparable quality of the photographs. This enhances the time each patient spends in the apparatus.
  • the present invention intends to present an apparatus for dental X-ray photography that is capable of improving the shortcomings of conventional X-ray photography apparatuses.
  • the present invention provides an apparatus for X-ray photography according to independent claim 1.
  • Advantageous embodiments are subject matter of the dependent claims.
  • the invention provides an apparatus which can keep an X-ray beam away from a non-imageable area in a photographing process in a scanning mode of asymmetric rotation of an X-ray source and an image detecting device.
  • this apparatus for X-ray photography has characteristics of a scanning mode of bilateral three-dimensional partial center rotation within a limited angle, and a dental scanning range of humans is divided into a left half part and a right half part according to the bone anatomical structure of the human body.
  • a dental radiographing range is scanned in such a manner that a detecting device is oriented toward a center in a fixed manner and an X-ray emitting source rotates about the center of a circle and radiates light, and an X-ray block element is used for shaping a conical X-ray beam irradiating field, so that an edge tangent of the irradiating field is kept away from non-dental X-ray radiographing tissues such as the skull and the neck portion, and enters an X-ray penetration range.
  • the X-ray scanning covers the full dental scanning range of thefull oral cavity with minimum penetration attenuation.
  • the present invention provides an apparatus for X-ray photography, which includes an X-ray source, a first driving device, and an image detecting device.
  • the X-ray source has a light emitting end, the light emitting end is provided with a block element.
  • the X-ray source generates an X-ray beam through the light emitting end, and the block element is used for constraining a projection field of the X-ray beam, so that the X-ray beam has a first boundary.
  • the X-ray beam is cast onto an object, and the object has a reference center and an imageable area.
  • the first driving device is used for driving the X-ray source to rotate around the object within an angle range with the reference center of the object as a center.
  • the X-ray beam is projected onto the imageable area, and when the X-ray source is located at a first position, the first boundary passes through the reference center.
  • the image detecting device is disposed at a side of the object and faces the X-ray source. After being cast onto the object, the X-ray beam is projected onto the image detecting device, thereby forming an image on the image detecting device.
  • an apparatus for X-ray photography 20 includes an X-ray source 21 and an image detecting device 22.
  • the X-ray source 21 is disposed at one side of an object 30, and the image detecting device 22 is disposed at the other side of the object 30 and faces the X-ray source 21.
  • the X-ray source 21 has a light emitting end 211, and the light emitting end 211 is provided with a block element 23.
  • the X-ray source 21 generates X-ray beams 24 and 24' through the light emitting end 211.
  • the block element 23 is used for constraining projection field of the X-ray beams 24 and 24', so that the X-ray beam has a first boundary 241.
  • the block element 23 is a shield block, made of a material capable of blocking radioactive rays, for example, but not limited to, a lead block or a cement block. Through shielding provided by the block element 23, the beam 24' is shielded, so that only the beam 24 of the beams generated by the X-ray source 21 is left.
  • the first boundary 241 can be considered as a central line of the beams 24 and 24'.
  • the X-ray beam 24 is cast onto the object 30, and the object 30 is the skull of a human body.
  • the object 30 has imageable areas 29a and 29b, and the imageable areas 29a and 29b are located below the cranium base and in a range of the oral cavity and the jaw and facial bones in front of an EAM.
  • the imageable areas are an area (a fan-shaped area with an entire angle of 266 degrees) in the cranium base with the petrous pyramid and the midsagittl plane as boundaries and the sellaturcica 31 as a vertex and having left and right angles of 133 degrees and a round cake column range having a height from the IOML of the skull to the mandible base.
  • a symmetrical pyramid structure formed with the petrous pyramid and the midsagittl plane as boundaries and the sellaturcica 31 as a vertex and having left and right angles of 47 degrees is a non-imageable area (a fan-shaped area of an entire angle of 94 degrees).
  • a center of the sellaturcica 31 serves as a reference center of the object 30.
  • the X-ray source 21 is connected to a first driving device 25, and the first driving device 25 is used for driving the X-ray source 21 to rotate, with the reference center of the object 30 (that is, the center of the sellaturcica 31) as a center, around the object 30 within a range of an angle ⁇ 1 from a first position P1 to a second position P2.
  • the first driving device 25 is a rotation module, for example, a combination of a motor and a rotation arm.
  • the rotation arm is connected to the X-ray source 21, and by means of a rotating force of the rotation module, the rotation arm is driven to rotate, thereby driving the X-ray source 21 to rotate.
  • the first driving device 25 is not limited to the driving device shown in FIG.
  • the first driving device 25 can implement the first driving device 25 in different manners according to the prior art.
  • the X-ray source 21 rotates, with the reference center of the object 30 (that is, the center of the sellaturcica 31) as a center, around the object 30 in a range of an angle ⁇ 1 from the first position P1 to the second position P2.
  • the image detecting device 22 is connected to a second driving device 27, and the second driving device is used for driving the image detecting device 22 to present an asymmetric scanning mode with the X-ray source 21.
  • the image detecting device 22 and the X-ray source 21 are rotated in an asynchronous manner, so that the image detecting device 22 and the X-ray source 21 are kept at positions where the X-ray beam 24 passing through the object 30 can be received.
  • the second driving device 27 is a rotation module, for example, a combination of a motor and a rotation arm.
  • the rotation arm is connected to the image detecting device 22, and by means of a rotating force of the rotation module, the rotation arm is driven to rotate, thereby driving the image detecting device 22 to rotate.
  • the image detecting device 22 is not rotated synchronously with the X-ray source 21 but is rotated at an asynchronous rotation angle to a position where the beam passing through the object 30 can be received.
  • the image detecting device 22 when no beam is generated, the image detecting device 22 is first rotated to a fixed position, and then the X-ray source 21 is enabled to generate an X-ray beam, and the X-ray beam is cast onto the object by means of rotation. Therefore, in the embodiments of the present invention, when the X-ray source 21 is rotating, the image detecting device 22 is kept fixed.
  • the first boundary 241 is directly used as a bottom boundary 29d of the left 133-degree area with the sellaturcica 31 as a vertex in the imageable areas 29a and 29b.
  • the first boundary 241 is rotated with the center of the sellaturcica 31 as a center. Therefore, in the rotation process of the X-ray source 21, the X-ray beam 24 is always projected onto the imageable area, and will not be projected onto the non-imageable area.
  • a third position P3 is a rotation limit of the X-ray source 21.
  • the X-ray source 24 is not necessarily rotated to the limit position P3.
  • the irradiating field of the X-ray beam becomes an asymmetric irradiating filed, and the first boundary 241 at a side becomes a boundary of the imageable area when the X-ray source 21 is rotated to the first and second positions.
  • a structure of the embodiment is symmetrical to a structure of the embodiment shown in FIG. 2A .
  • the apparatus for X-ray photography 20 in FIG. 2A is mainly used for scanning a left image of the object 30, and the apparatus for X-ray photography 20 in FIG. 4 is mainly used for scanning a right image of the object 30.
  • a user may set the apparatus for X-ray photography 20 on one side of the object 30, and then controls the apparatus for X-ray photography 20 to move from one side of the object 30 to the other side of the object 30, provided that the X-ray beam 24 is controlled to be away from the non-imageable area in the movement process.
  • the manner of moving the X-ray source on the other side can be obtained with reference to the content corresponding to the FIG. 2A and FIG. 2B .
  • FIG. 4 is a front view of the skull 10
  • FIG. 4A and FIG. 4B are respectively a right view and a left view of the skull 10.
  • IOMLs on the left and right sides of the skull 10 are respectively located, and the IOML is a distance from the lower eye socket 12 to the EAM 13 of the skull 10.
  • surface reference points C1 and C2 are defined at positions with a length L from the EAM 13 on the left and right IOMLs, and the length L is located within a range of 1/4 o 1/3 of the IOML. For example, if the IOML is 9.6 centimeters, lengths of distances from the surface reference points C1 and C2 to the EAM are about 2.4 to 3.2 centimeters.
  • the surface reference points C1 and C2 on the two sides of the skull 10 are symmetrical to each other.
  • an intersection point of a line linking the surface reference points C1 and C2 and a central sagittal section of the skull is used as a central axis reference point C, as shown in FIG. 4 .
  • the central axis reference point C is located inside the skull 10, and when X-ray radiographical scanning is actually performed on a subject, the IOML of the head of the subject is parallel to the ground when the subject is in a standing or sitting state, and an axial line passing through the central axis reference point C and being perpendicular to the ground is defined as the reference central axis of the X-ray rotational scanning.
  • the IOML of the head is perpendicular to a bed surface contacted by the head, and an axial line passing through the central axis reference point C and being parallel to the bed surface and a head-to-foot direction of a flat-lying human body is defined as a reference central axis of the X-ray rotational scanning.
  • the subject may be in the standing state, the head of the subject is placed in an X-ray radiographing range, the IOML of the head is parallel to the ground, and the central sagittal section of the skull is tangent to a 180-degree angle position of the X-ray scanning.
  • the subject occludes teeth, and an occlusal surface is at a height approximately corresponding to a central horizontal line of a light sensing area of the detecting device, and an axial line passing through the central axis reference point C and being perpendicular to the ground is defined as the reference central axis of the X-ray rotational scanning.
  • the apparatus for X-ray photography since the X-ray beam can be kept away from non-dental X-ray radiographing tissues such as the skull bone and the neck portion, direct exposure of a human body to the X-ray scanning beam can be avoided, and extra X-ray penetration attenuation can be reduced, so that the X-ray source can use a low power to output a radiation dose sufficient for an image receiving device to form an image, and meanwhile, the radiation dose received by the human body is decreased.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Medical Informatics (AREA)
  • Radiology & Medical Imaging (AREA)
  • Molecular Biology (AREA)
  • Biophysics (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Veterinary Medicine (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Optics & Photonics (AREA)
  • Pathology (AREA)
  • Public Health (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Physics & Mathematics (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Apparatus For Radiation Diagnosis (AREA)

Claims (2)

  1. Appareil de radiographie comprenant :
    une première source de rayons X (21) qui a une extrémité qui émet de la lumière, la première source de rayons X générant un faisceau de rayon X par l'extrémité qui émet de la lumière (211),
    un premier dispositif d'entraînement (25) utilisé pour entraîner la première source de rayons X (21) en rotation à l'intérieur d'une étendue angulaire autour d'un centre, le faisceau de rayon X étant projeté sur un objet dans le processus de rotation de la première source de rayons X (21),
    un dispositif détecteur d'image (22) en face de la première source de rayons X (21), le faisceau de rayon X étant projeté sur le dispositif détecteur d'image après avoir été lancé sur l'objet en formant ainsi une image sur le dispositif détecteur d'image et
    un second dispositif d'entraînement (27) relié au dispositif détecteur d'image (22) et utilisé pour entraîner le dispositif détecteur d'image (22) en rotation à l'intérieur d'une étendue angulaire autour du centre,
    caractérisé en ce que
    l'extrémité qui émet de la lumière (211) est pourvue d'un élément de bloc (23), l'élément de bloc étant un bloc écran pour écranner une partie du faisceau de rayon X et étant utilisé pour limiter un champ de projection du faisceau de rayon X si bien qu'un champ d'irradiation du faisceau de rayon X devient un champ d'irradiation asymétrique et que le faisceau de rayon X a une première frontière qui traverse le centre et
    la première source de rayons X (21) et le dispositif détecteur d'image (22) tournent autour du centre de manière asynchrone.
  2. Appareil de radiographie selon la revendication 1, la première frontière tournant autour du centre dans le processus de rotation de la première source de rayons X (21).
EP13181626.6A 2012-11-20 2013-08-23 Appareil de radiographie Not-in-force EP2732766B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TW101143280A TWI488612B (zh) 2012-11-20 2012-11-20 Ｘ光投影成像裝置

Publications (2)

Publication Number Publication Date
EP2732766A1 EP2732766A1 (fr) 2014-05-21
EP2732766B1 true EP2732766B1 (fr) 2016-11-16

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US (1) US9161729B2 (fr)
EP (1) EP2732766B1 (fr)
ES (1) ES2615552T3 (fr)
TW (1) TWI488612B (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150088679A (ko) * 2014-01-24 2015-08-03 주식회사바텍 Ct 촬영 장치
US10178980B2 (en) * 2014-06-19 2019-01-15 Analogic Corporation Radiation sources and detector array for imaging modality
TWI509564B (zh) * 2014-10-30 2015-11-21 Inst Nuclear Energy Res Atomic Energy Council 三維成像的投影方法
US9649083B2 (en) * 2014-12-10 2017-05-16 General Electric Company System and method for recalibrating a monochromatic image

Citations (2)

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Publication number Priority date Publication date Assignee Title
US20070183559A1 (en) * 2006-02-01 2007-08-09 Eckhard Hempel X-ray CT system for producing projective and tomographic phase contrast images
EP2659838A1 (fr) * 2012-05-02 2013-11-06 J. Morita Manufacturing Corporation Appareil de tomographie par rayons X

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US7156655B2 (en) * 2001-04-13 2007-01-02 Orametrix, Inc. Method and system for comprehensive evaluation of orthodontic treatment using unified workstation
DE10129764A1 (de) * 2001-06-20 2003-01-23 Siemens Ag Computertomographiegerät
US8144829B2 (en) * 2008-02-27 2012-03-27 The Board Of Trustees Of The Leland Stanford Junior University Cone-beam CT imaging scheme
EP2446822B1 (fr) * 2009-06-25 2019-05-08 The Yoshida Dental Mfg. Co., Ltd. Dispositif photographique à rayons x
JP2011019633A (ja) * 2009-07-14 2011-02-03 Toshiba Corp Ｘ線診断装置及び被曝線量低減用制御プログラム
JP4911373B2 (ja) * 2009-11-26 2012-04-04 横河電機株式会社 Ｘ線測定装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070183559A1 (en) * 2006-02-01 2007-08-09 Eckhard Hempel X-ray CT system for producing projective and tomographic phase contrast images
EP2659838A1 (fr) * 2012-05-02 2013-11-06 J. Morita Manufacturing Corporation Appareil de tomographie par rayons X

Also Published As

Publication number Publication date
TW201420082A (zh) 2014-06-01
EP2732766A1 (fr) 2014-05-21
TWI488612B (zh) 2015-06-21
ES2615552T3 (es) 2017-06-07
US9161729B2 (en) 2015-10-20
US20140140478A1 (en) 2014-05-22

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